I remember playing this map back in the day, and it remains one of my favourites. However, there is still much room for improvement.

In addition to what other folks have said, there is much impassible terrain that is not visibly distinctive as impassible. Much of the highway medians, and a good amount of terrain on the sides. Restricting movement is fine, but it should be obvious to the player what is and is not an obstacle. I would recommend removing the impassible terrain in the centre of the highways, as it adds little and is just plain irritating.

It should be noted that the Scavengers do not use the factories or trucks you have provided them, it would be better to replace them with Scavenger factories so that they may produce their own units, and with the Ultimate Scav Mod, their own trucks.
I would also suggest removing some of the Scavenger defences within the base area, the AI often tries to build base buildings in areas with those defences, sometimes losing all of their trucks before ever erecting a factory.

Noticed the bases are a tad cluttered causing the AI to not do anything. Aside from there being too much in the base areas those paths in and out need to be a tad wider. Other than that it's an interesting map.